Volumetric, acoustic and transport properties of binary mixtures of benzyldimethylammonium based ionic liquids with N, N-dimethylformamide at temperature from 293.15 to 328.15 K

摘要

The experimental density, ρ, speed of sound, u and viscosity, η values as a function of ionic liquid concentration,m for binary mixtures (benzyldimethylammonium propionate/benzyldimethylammonium hexanoate+N, Ndimethylformamide) were measured at T=293.15 to 328.15 K and at atmospheric pressure. Apparent molar volumes, V_Φ, and apparent molar isentropic compressibilities, K_(s,Φ), have been determined fromthe experimental densities and speed of sound and fitted to a Redlich-Mayer equation for the calculation of limiting parameters (V_Φ~∞ and K_Φ~∞). The calculated V_Φ~∞ and K_Φ~∞ values indicate that ionic liquid-molecular solvent interactions are stronger for benzyldimethylammoniumhexanoate (BDMAH) inDMF than the benzyldimethylammoniumpropionate (BDMAP) in DMF mixtures. The limiting apparent molar expansibilities, α at each temperature for both ionic liquids in DMF have positive values. The viscosity data have been analyzed using the Jones-Dole equation, and the derived parameters B and A have also been interpreted in terms of ion-solvent and ion-ion interactions.